Fed knew the result of Kei (pathetic loss) before he started the last match in the group. So, Fed already knew he & Kandy would advance, no matter the result of their match (a theoretical, pathetic 6-1 6-0 to Kandy would have altered that reality but no nobody believed in such result as long as Fed stayed on his legs), the match was just an exhibition rather than competition. Very weird. But at the same time, it removed any pressure from Fed who came to the court thinking maybe about a baby step toward Connors win record but nothing else.
So, the group final standing is precisely as expected despite an early hiccup by Fed. I expect the other group standing to also follow the suit, Fed will play Zverev in SF & Joker in F. Well, there is quite a small but real chance that he will play Kandy again in F, in which case we would have to conclude that the "field" in these ATP finals was as "weak" as in last year. Anyway, purely from Kandy's emotional point of view, he's already learned Fed scalp at wimby, so he's not motivated as much anymore, but he hasn't had a big win against an "in form" Joker yet, including his close loss in wimby 2015. So, he'll be looking for revenge herein this SF. As a Fed fan, I entertain such possibility, even if I draw anger from Joker's fans, e.g. from Fiero.